Where To Find Prerequisite Information
The name/token callable services are available to both unauthorized (problem state and PSW key 8-15) and authorized (supervisor state or PSW key 0-7) programs. z/OS MVS Programming: Assembler Services Guide introduces the name/token callable services and discusses functions that are available to all programs. The following topics discuss functions of the name/token callable services that are available to authorized programs only. Before reading the following topics, read about the name/token callable services in z/OS MVS Programming: Assembler Services Guide.
Name/token callable services allow you to share data between two programs running under the same task, or between two or more tasks or address spaces. To share data, programs often need to locate data or data structures acquired and built by other programs. The data structures and the programs using them need not reside in the same address space. Name/token callable services provide a way for programs to save and retrieve the data.